richkadel added a comment. I don't know if this is helpful or not, but we ran into a problem, recently, on Fuchsia when upgrading Clang (I believe to LLVM 14), and realized that the LLVM tools from Clang's version of LLVM were in compatible with the Rust profraw files. Since you're probably using a Rust compiler that's compatible with LLVM 13 (if not earlier), you may need to make sure you're using Rust's bundled LLVM tools (`llvm-profdata` and `llvm-cov`) to process those files.
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